• 제목/요약/키워드: meta power

검색결과 121건 처리시간 0.027초

문제 해결력 신장을 위한 베타 문제 유형 개발 (Development of Meta Problem Types to Improve Problem-solving Power)

  • 현종익
    • 한국수학교육학회지시리즈C:초등수학교육
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    • 제2권1호
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    • pp.3-13
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    • 1998
  • In mathematics education we have focused on how to improve the problem-solving ability, which makes its way to the new direction with the introduction of meta-cognition. As meta-cognition is based on cognitive activity of learners and concerned about internal properties, we may find a more effective way to generate learners problem-solving power. Its means that learners can regulate cognitive process according to their gorls of learning by themselves. Moreover, they are expected to make active participation through this process. If specific meta problems designed to develop meta-cognition are offered, learners are able to work alone by means of their own cognition and regulation while solving problems. They can transfer meta-cognition to the other subjects as well as mathematics. The studies on meta-cognition conducted so far may be divided into these three types. First in Flavell([3]) meta-cognition is defined as the matter of being conscious of one's own cognition, that is, recognizing cognition. He conducted an experiment with presschoolers and children who just entered primary school and concluded that their cognition may be described as general stage that can not link to specific situation in line with Piaget. Second, Brown([1], [2]) and others argued that meta-cognition means control and regulation of one's own cognition and tried to apply such concept to classrooms. He tried to fined out the strategies used by intelligent students and teach such types of activity to other students. Third, Merleary-Ponty (1962) claimed that meta-cognition is children's way of understanding phenomena or objects. They worked on what would come out in children's cognition responding to their surrounding world. In this paper following the model of meta-cognition produced by Lester ([7]) based on such ideas, we develop types of meta-cognition. In the process of meta-cognition, the meta-cognition working for it is to be intentionally developed and to help unskilled students conduct meta-cognition. When meta-cognition is disciplined through meta problems, their problem-solving power will provide more refined methods for the given problems through autonomous meta-cognitive activity without any further meta problems.

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A genome-wide association study of reproduction traits in four pig populations with different genetic backgrounds

  • Jiang, Yao;Tang, Shaoqing;Xiao, Wei;Yun, Peng;Ding, Xiangdong
    • Asian-Australasian Journal of Animal Sciences
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    • 제33권9호
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    • pp.1400-1410
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    • 2020
  • Objective: Genome-wide association study and two meta-analysis based on GWAS performed to explore the genetic mechanism underlying variation in pig number born alive (NBA) and total number born (TNB). Methods: Single trait GWAS and two meta-analysis (single-trait meta analysis and multi-trait meta analysis) were used in our study for NBA and TNB on 3,121 Yorkshires from 4 populations, including three different American Yorkshire populations (n = 2,247) and one British Yorkshire populations (n = 874). Results: The result of single trait GWAS showed that no significant associated single nucleotide polymorphisms (SNPs) were identified. Using single-trait meta analysis and multi-trait meta analysis within populations, 11 significant loci were identified associated with target traits. Spindlin 1, vascular endothelial growth factor A, forkhead box Q1, msh homeobox 1, and LHFPL tetraspan submily member 3 are five functionally plausible candidate genes for NBA and TNB. Compared to the single population GWAS, single-trait Meta analysis can improve the detection power to identify SNPs by integrating information of multiple populations. The multiple-trait analysis reduced the power to detect trait-specific loci but enhanced the power to identify the common loci across traits. Conclusion: In total, our findings identified novel genes to be validated as candidates for NBA and TNB in pigs. Also, it enabled us to enlarge population size by including multiple populations with different genetic backgrounds and increase the power of GWAS by using meta analysis.

A Design of 8.5 GHz META-VCO based-on Meta-material using 65 nm CMOS Process

  • Lee, Jongsuk;Moon, Yong
    • JSTS:Journal of Semiconductor Technology and Science
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    • 제16권5호
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    • pp.535-541
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    • 2016
  • A low phase noise META-VCO based-on meta-structure was designed using 65 nm CMOS process. We used a meta-structure to get good phase noise characteristics. The measured phase noises are -67.8 dBc/Hz, -96.37 dBc/Hz, and -107.37 dBc/Hz at 100 kHz, 1 MHz, and 10 MHz offset respectively. The META-VCO operates 8.45~8.77 GHz according to VCTRL, and the output power is -19.12 dBm. The power consumption is 28 mW with 1.2-V supply voltage. The calculated FOM is -140.76 dBc/Hz.

Effects of Taekwondo training on physical fitness factors in Korean elementary students: A systematic review and meta-analysis

  • Nam, Sang-Seok;Lim, Kiwon
    • 운동영양학회지
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    • 제23권1호
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    • pp.36-47
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    • 2019
  • [Purpose] We conducted a meta-analysis to evaluate the effects of Taekwondo training on the physical fitness factors in Korean elementary students comprehensively and quantitatively. [Methods] We classified research studies published until November 2018 according to the Preferred Reporting Items for Systematic Reviews and Meta-Analyses guidelines and selected a total of 17 research items; a meta-analysis of these items was then conducted. We used the Comprehensive Meta-Analysis 3.0 and Review Manager 5.3 to analyze the mean effect size, study quality, and publication bias. [Results] Taekwondo training improved the cardiopulmonary endurance, muscle endurance, and power of the elementary students, but was not practical or less useful on other physical fitness factors. The meta-regression analysis of the cardiopulmonary endurance and power items showed that the effect size was large when the sample size was small. Therefore, it is necessary to consider the sample size in interpreting the effect size for these two items. Further, during correction of the publication bias for the power items, the improvement effect by Taekwondo training was eliminated. [Conclusion] Taekwondo training is helpful for improving the cardiopulmonary endurance and muscle endurance of Korean elementary students but is not useful for other physical fitness factors.

Meta-Material을 이용한 소형 Wilkinson 전력 분배기 설계 (Design of a Compact Wilkinson Power Divider Using Meta-Material Lines)

  • 김정표;김기호;양묘근;성원모
    • 한국전자파학회논문지
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    • 제17권10호
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    • pp.953-958
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    • 2006
  • 본 논문에서는 meta-material 전송 선로를 이용하여 소형 Wilkinson 전력 분배기를 구현하였다. 구현된 전력 분배기는 $-90^{\circ}$ 위상차를 갖는 길이가 ${\lambda}_g/4$인 전송 선로를 $+90^{\circ}$ 위상차를 갖는 MM 전송 선로로 대체하였다. 추가된 MM 전송 선로는 3개의 단위 셀로 구성되어 있으며, 각 단위 셀은 $+30^{\circ}$ 위상 천이 특성을 갖도록 구성되었다. 제안된 전력 분배기를 이용할 경우, 동작 주파수인 200 MHz에서 210mm인 ${\lambda}_g/4$의 길이를 18 mm로 줄일 수 있으며, 이는 91.4 %의 소형화가 가능하다.

Beta-Meta: a meta-analysis application considering heterogeneity among genome-wide association studies

  • Gyungbu Kim;Yoonsuk Lee;Jeong Ho Park;Dongmin Kim;Wonseok Lee
    • Genomics & Informatics
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    • 제20권4호
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    • pp.49.1-49.7
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    • 2022
  • Many packages for a meta-analysis of genome-wide association studies (GWAS) have been developed to discover genetic variants. Although variations across studies must be considered, there are not many currently-accessible packages that estimate between-study heterogeneity. Thus, we propose a python based application called Beta-Meta which can easily process a meta-analysis by automatically selecting between a fixed effects and a random effects model based on heterogeneity. Beta-Meta implements flexible input data manipulation to allow multiple meta-analyses of different genotype-phenotype associations in a single process. It provides a step-by-step meta-analysis of GWAS for each association in the following order: heterogeneity test, two different calculations of an effect size and a p-value based on heterogeneity, and the Benjamini-Hochberg p-value adjustment. These methods enable users to validate the results of individual studies with greater statistical power and better estimation precision. We elaborate on these and illustrate them with examples from several studies of infertility-related disorders.

RF 마그네트론 스퍼터링에 의해 실리콘이 증착된 메타아라미드 직물의 성질 분석 (Properties of Silicon-deposited Meta-aramid Fabrics by RF Magnetron Sputtering)

  • 박종현;이선영;김춘수;강송희;김의화;이승구
    • 한국염색가공학회지
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    • 제29권1호
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    • pp.18-24
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    • 2017
  • Meta-aramid fabric has been widely used as the reinforcement of composites due to its high flame resistance and tearing strength. Functionality such as abrasion resistance of fabric is very important for specialty fabrics used in car racing suits. In this study, to improve abrasion resistance property of meta-aramid fabric, silicon deposition was conducted by utilizing RF magnetron sputtering. The sputtering process parameters effects were investigated as sputtering power and substrate temperature. The obtained results suggest that the silicon deposition on the meta-aramid fabric has obvious effect upon increasing the abrasion resistance, the thermal insulation and the electric resistance condition for silicon deposition was established. In conclusion, the results of this study have made it possible to manufacture meta-aramids with higher abrasion strength.

원전종사자의 방사선 노출과 암사망 위험도와의 관련성에 대한 메타분석 (Radiation Exposure and Cancer Mortality Among Nuclear Power Plant Workers: a Meta-analysis)

  • 박은숙;문기은;김한나;이원진;진영우
    • Journal of Preventive Medicine and Public Health
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    • 제43권2호
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    • pp.185-192
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    • 2010
  • Objectives: We conducted a meta-analysis to investigate the relationship between low external doses of ionizing radiation exposure and the risk of cancer mortality among nuclear power plant workers. Methods: We searched MEDLINE using key words related to low dose and cancer risk. The selected articles were restricted to those written in English from 1990 to January 2009. We excluded those studies with no fit to the selection criteria and we included the cited references in published articles to minimize publication bias. Through this process, a total of 11 epidemiologic studies were finally included. A publication bias was tested for using Egger's test. The homogeneity test was performed before the integration of each of the standardized mortality ratios (SMRs) and the result proved that the studies were heterogeneous. Results: We found significant decreased deaths from all cancers (SMR = 0.75, 95% CI = 0.62 - 0.90), all cancers excluding leukemia, solid cancer, mouth and pharynx, esophagus, stomach, rectum, liver and gallbladder, pancreas, lung, prostate, lymphopoietic and hematopoitic cancer. The findings of this meta-analysis were similar with those of the 15 Country Collaborative Study conducted by the International Agency for Research on Cancer. A publication bias was found only for liver and gallbladder cancer (p = 0.015). Heterogeneity was observed for all cancers, all cancers excluding leukemia, solid cancer, esophagus, colon and lung cancer. Conclusions: Our findings of low mortality for stomach, rectum, liver and gallbladder cancers may explained by the health worker effect. Yet further studies are needed to clarify the low SMR of cancers, for which there is no useful screening tool, in nuclear power plant workers.

치의학 분야에서의 메타 분석 (Meta-analysis in dental research)

  • 임회정
    • 대한치과의사협회지
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    • 제52권8호
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    • pp.478-490
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    • 2014
  • Recently, importance of meta-analysis is increasing in the field of dentistry, since it is not easy to settle controversies arising from conflicting studies. Meta-analysis is the statistical method of combining results from two or more individual studies that have been done on the same topic. Merits of meta-analysis include an increase in power, an improvement in precision, and the ability to address solution not provided by individual studies. However, it might mislead researchers when variation across studies and publication bias are not carefully taken into consideration. The purpose of this study is to help understand meta-analysis by making use of individual results in dental research paper.

수학 학습 메타 정의의 개념 요소와 의미 탐색 (Exploring the Conceptual Elements and Meaning of Meta-affect in Mathematics Learning)

  • 손복은;고호경
    • 한국수학교육학회지시리즈E:수학교육논문집
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    • 제35권4호
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    • pp.359-376
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    • 2021
  • 본 연구는 수학 학습에서 긍정적이거나 부정적으로 발현되는 학습자의 감정이나 학습자가 보유한 수학에 대한 신념, 태도가 수학 학습 결과에 영향을 미친다는 연구에 기반하여 학습자 감정이나 정의적 요소들을 학습자 자신의 학습 목표나 목적에 맞게 조절할 수 있는 요소를 강구하고자 하였다. 이를 위하여 메타 정의에 관련된 연구들을 연결망 분석을 통하여 종합적으로 분석함으로써 메타 정의의 정의적 요소를 추출하고 이에 대한 개념을 분류, 그 의미를 탐색하였다. 그 결과 메타 정의의 정의적 요소로서 감정, 태도, 신념, 메타 정의의 개념 요소는 알아차리기(자각), 평가, 조절, 활용, 모니터링으로 도출할 수 있으며, 각 개념 요소에 대한 의미를 정의하였다. 본 연구 결과는 수학교육 분야에서 의미 있게 다뤄지는 정의적 영역과 관련하여 정의적 요소의 규명이나 특성에 대한 고찰을 넘어, 수학 학습에서 감정적 영역을 조절하고 이를 활용하기 위한 방안으로의 메타 정의의 개념 요소와 의미를 탐색하였다는데 그 의의가 있다.